1 Corinthians 1:17; 1 Corinthians 9:15

1 Corinthians 1:17

17 For Christ sent me not to baptize, but to preach the gospel: not with wisdom of words, lest the cross of Christ should be made of none effect.

1 Corinthians 9:15

15 But I have used none of these things: neither have I written these things, that it should be so done unto me: for it were better for me to die, than that any man should make my glorying void.